I suspect that this is a duplicate of:
https://bugzilla.redhat.com/show_bug.cgi?id=191112
...you might want to try looking at captures with wireshark and see if the
server is sending a bogus BCC value in the LogoffANDX response. I'm going to
close this as a duplicate of that bug and suggest opening a case with netapp.
They may already have a filer patch that fixes this (I'm not sure).
Note that a patch recently went upstream to fix a potential buffer overflow in
CIFS. That patch has the side effect of making the client not expect a response
from the server for Logoff requests. That may also work around this problem, but
it's not in Fedora yet.
*** This bug has been marked as a duplicate of 191112 ***

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